diff --git a/tests/Gtest-bt.c b/tests/Gtest-bt.c
index 152e2af3..408a3353 100644
--- a/tests/Gtest-bt.c
+++ b/tests/Gtest-bt.c
@@ -26,7 +26,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
 #endif
 
 #include <errno.h>
-#if HAVE_EXECINFO_H
+#ifdef HAVE_EXECINFO_H
 # include <execinfo.h>
 #else
   extern int backtrace (void **, int);
diff --git a/tests/test-flush-cache.c b/tests/test-flush-cache.c
index 180b5c2e..922e08c7 100644
--- a/tests/test-flush-cache.c
+++ b/tests/test-flush-cache.c
@@ -29,7 +29,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
 # include "config.h"
 #endif
 
-#if HAVE_EXECINFO_H
+#ifdef HAVE_EXECINFO_H
 # include <execinfo.h>
 #else
   extern int backtrace (void **, int);